import 'package:flutter/material.dart';
import 'package:flutter/services.dart';

void runMain(List<String> args) {
  runApp(channelMain());
}

Widget channelMain() => const ChannelApp();

class ChannelApp extends StatelessWidget {
  const ChannelApp({super.key});

  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: '',
      debugShowCheckedModeBanner: false,
      theme: ThemeData.light(),
      home: const ChannelHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class ChannelHomePage extends StatefulWidget {
  const ChannelHomePage({super.key, required this.title});

  // This widget is the home page of your application. It is stateful, meaning
  // that it has a State object (defined below) that contains fields that affect
  // how it looks.

  // This class is the configuration for the state. It holds the values (in this
  // case the title) provided by the parent (in this case the App widget) and
  // used by the build method of the State. Fields in a Widget subclass are
  // always marked "final".

  final String title;

  @override
  State<ChannelHomePage> createState() => _ChannelHomePageState();
}

class _ChannelHomePageState extends State<ChannelHomePage> {
  int _counter = 0;

  void _incrementCounter() {
    setState(() {
      // This call to setState tells the Flutter framework that something has
      // changed in this State, which causes it to rerun the build method below
      // so that the display can reflect the updated values. If we changed
      // _counter without calling setState(), then the build method would not be
      // called again, and so nothing would appear to happen.
      _counter++;
      if (_counter > 10) {
        _counter %= _counter;
      }
      switch (_counter) {
        case 3:
          channelMessage();
          break;
        case 5:
          channelText();
          break;
        case 10:
          channelBack();
          break;
        default:
          break;
      }
    });
  }

  String textContent = '点击按钮，每次 +1 ';

  static const channel = MethodChannel('flutter_bridge');

  Future<String> _channelFunc(String funcName) async {
    return await channel.invokeMethod(funcName);
  }

  Future<void> channelMessage() async {
    String result = "调用原生";
    try {
      setState(() {
        textContent = result;
      });
      result = await _channelFunc("Native");
    } on PlatformException catch (e) {
      result = "请继续点击，但每次会 +2 ！";
    }
    setState(() {
      textContent = result;
    });
  }

  Future<void> channelText() async {
    String result = "调用原生";
    try {
      setState(() {
        textContent = result;
      });
      result = await _channelFunc("Text");
    } on PlatformException catch (e) {
      result = "请继续点击，但每次会 +3 ！";
    }
    setState(() {
      textContent = result;
    });
  }

  Future<void> channelBack() async {
    String result = "调用原生";
    try {
      setState(() {
        textContent = result;
      });
      result = await _channelFunc("Back");
    } on PlatformException catch (e) {
      result = "请继续点击，但每次会 +4 ！";
    }
    setState(() {
      textContent = result;
    });
  }

  @override
  Widget build(BuildContext context) {
    // This method is rerun every time setState is called, for instance as done
    // by the _incrementCounter method above.
    //
    // The Flutter framework has been optimized to make rerunning build methods
    // fast, so that you can just rebuild anything that needs updating rather
    // than having to individually change instances of widgets.
    return Scaffold(
      body: Center(
        // Center is a layout widget. It takes a single child and positions it
        // in the middle of the parent.
        child: Column(
          // Column is also a layout widget. It takes a list of children and
          // arranges them vertically. By default, it sizes itself to fit its
          // children horizontally, and tries to be as tall as its parent.
          //
          // Invoke "debug painting" (press "p" in the console, choose the
          // "Toggle Debug Paint" action from the Flutter Inspector in Android
          // Studio, or the "Toggle Debug Paint" command in Visual Studio Code)
          // to see the wireframe for each widget.
          //
          // Column has various properties to control how it sizes itself and
          // how it positions its children. Here we use mainAxisAlignment to
          // center the children vertically; the main axis here is the vertical
          // axis because Columns are vertical (the cross axis would be
          // horizontal).
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            Text(
              textContent,
            ),
            Text(
              '$_counter',
              style: Theme.of(context).textTheme.headlineMedium,
            ),
          ],
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: _incrementCounter,
        tooltip: 'Increment',
        child: const Icon(Icons.add),
      ), // This trailing comma makes auto-formatting nicer for build methods.
    );
  }
}
